Adjustable scraper for roller-mills



(No Model.)

J. HARVEY. ADJUSTABLE SGRAPER FOR ROLLER MILLS.

Patented Aug. 80, 1892.

kw. H

[N V E /V TO]? A TTO/M/EYS.

WITNESSES.-

NITED STATES- JOHN HARVEY, OF BROOKLYN, NEW YORK.

ADJUSTABLE-SCRAPER FOR ROLLER-MILLS.-

SPEOIFICATION' forming part of Letters Patent No. 481,866, dated August 30, 1892.

Application filed May 21, 1891.

To all whom it mayconcern;

Be it known that I, JOHNHARVEY, of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Adjustable Scrapers for Roller- Mills, of which the following is a full, clear, and exact description.

The object of this invention is to further improve the construction of the adjustable scraper patented by me June 3, 1890, No. 429,381.

To this end my invention consists in the peculiar construction and combination of parts, as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the views.

Figure 1 is an end elevation ofaroller-mill frame shown broken away.below,"a side view of a crushing-roller thereon, and a scraper having the improvements secured on the frame below the roller. Fig. 2 is a transverse section of four rollers on a frame, shown broken at the ends, and an improved rollerscraper below each roller, also shown in crosssection, on the line 2 2 in Fig. 1. Fig. 3 is a a plan View, enlarged, of one of the scrapers on a frame, shown broken; and Fig. 4 is an enlarged cross-section of the improved scraper device, taken on the line 4 4 in Fig. 1.

In the patented scraper of my invention previously mentioned an elongated frame is provided, (shown at A in the drawings,) said frame having a base-plate a and a Vertical flange I) along one side edge of the base-plate at a right angle thereto. Integral ears 0 are formed in pairs oppositely projected at each end of the base-plate of the frame A to receive set-screw bolts d, which serve to secure the scraper-frame in place on ledges e of the main-mill-frame sides B. There are vertical lugs g formed on the edge of the base-plate a opposite to and parallel wlth the vertical flange b, said lugs in proper number having the set-screw bolts g inserted through tapped perforations therein, which bolts project at right angles to the face of the flange b and toward the same. The set-screw bolts g have washer-plates It oppositely secured on the adjacent face of a clamping-strip O, whereon Serial No. 393,532. (Nomodeh) I they bear, as willbe explained, or said plates may be dispensed with if the piece they bear upon is made of metal.

Between the inner ends of the set-screw bolts 9' and the inner face of the flangeb the clamping-strip O is loosely inserted,said strip being preferably made of wood or other material that is not liable to produce sparks if it is impinged upon by the roller D above it, the strip being designed to clamp a scraperstrip E, of slightly-yielding materialsuch as leather, vegetable fiber, or like substancethat is designed to have contact with the lower surface of a mill-roller and remove crushed grain therefrom.

The parts thus briefly mentioned are effective in operation; but it has been found in practice that it is desirable to furnish improved means for the vertical adjustment of the scraper-stripE, and to this end means are provided that constitute the essential features of this invention and will be described. There is a follower-bar G inserted below the scraperstrip E, of about an equal thickness therewith, which is made of metal, the length of the strip E and follower-bar being about equal to that of the frame A. Directly below the follower-bar G any suitable number of setscrews m are inserted through tapped holes in the base-plate a of the frame A, so as to elevate the follower, as may be required, jam-nuts m being placed on said screws to secure them when adjusted. By provision of the follower-bar G a base of rigid material is afforded for the scraper-strip E, which is seated thereon, so that the set-screws m below the follower-bar,bearingdirectlyupon it, will elevate the bar and scraper -strip until the latter is almost completely worn away, a scraper-strip of less width being admissible, as well as short-er set-screw bolts, when the follower-bar is employed. The upward movement of the follower-bar and scraper-strip independently of the clamping-strip O distinguishes this device from that shown in Patent No. 429,381.

In order to release the scraper-strip E from the clamping-strip O, and thus facilitate the vertical adjustment of parts, as explained, there are screws n provided to retain the clamping-strip from rising, said screws being holes through which the screws or arepassed in the base-plate a-aiford freedom for a slight lateral movement of the shanks of said screws therein, so that the upper edge porw tion of the clamping-strip C may be rocked sufficientlytoward thescraper-stripE to clamp it firmlyagai-nst the vertical flange b by a movement of the set-screw bolts g, and if the scraper-strip requires to be elevated to'compensate for wear on its top edge the slacking of said screw-bolts will allow the clampingstrip to assume an upright position, thus releasing the scraper-stri p,Wl1icl1 can be vertically adjusted by the set-screw bolts m,-as before mentioned.

Itiwillbe evident from the foregoing description of the additional featu res ofimprovementthat the vertical "adjustment of' the scraper-strip E will be facilitated and enable an operator to bring the exactdegree of pressure upon the surface of the rollerthatis needed to cause theengaged edge of the scraper-strip to remove compacted crushedgrain from the surface of the roller,and, furthermore; fur nish means to use the scraper-strips until they are almost entirely worn away, thereby economizing the material, as wellas aifordiug improved means for securing the strips in place below the rollers of roller-mills.

Having thus described my inventiomwhat I claim as new, and desire to secure by Letters Patent, is

1. The combination, with a frame having a base-plate, an integral flange thereon at right angles thereto and aligning with one edge thereof, and set-screw bolts engaging lugs that are opposite the flange of the base-plate, of a clamping-strip between the lugs and flange, a scraper-strip that may be held by the clamping strip, a follower bar below the scraperstrip, and screws to vertically adjust the follower-bar, whichare inserted through thebaseplate of the scraper-frame, substantially as described.

2. The combination, with a scraperframe that is adapted tobe secured upon a rollermilli frame; belowwa roller; thereon, having a base-plate andwa vertical flange-on one edge of the'base-platmlugs on the base-plate opposite i the flange, which i are perforated ,and tapped, and set-screw bolts insaid lugs, of a clamping strip loosely secured on the base- .plate; byscrews; that pass through enlarged holes in the base-plate of the scraper-frame,

ascraper-strip between the flange and clampiug strip, a follower bar below the scraperstrip, and set-screw bolts which have athreaded engagementwiththebase-plate of theframe and bear onthe lower edge of the follower, substantially as described.

JOHN HARVEY. 

